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TS2345 Error when using string literal types in array.map #11054

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@k8w

Description

@k8w

TypeScript Version: 1.8.0 / nightly (2.0.0-dev.201xxxxx) 2.0.2@rc

Code

interface FolderContentItem{
    type: 'folder' | 'file';
}

let a:FolderContentItem[] = [];
a = [1,2,3,4,5].map(v=>({type:'folder'}))

Expected behavior:
Compiled successfully

Actual behavior:

test.ts(6,1): error TS2322: Type '{ type: string; }[]' is not assignable to type 'FolderContentItem[]'.
  Type '{ type: string; }' is not assignable to type 'FolderContentItem'.
    Types of property 'type' are incompatible.
      Type 'string' is not assignable to type '"folder" | "file"'.

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